"taxonomy" pages links

For some reason, after i installed a few plugins from your site, the menu 'browse by' pages only take you to "Members Support" page (just a normal page) I even deleted this page completely!

Seems like all "taxonomy" pages do that, which includes category pages.

Any idea if one of the plugins that I installed maybe messing things up?

example:
this page should show category listing, but instead it shows the "support page that does not exist...
http://www.lebanonrealstate.com/?property_buyorrent=buy